Sharp UX-B800A, Service Manual, Page: 72 / 140

UX-B800A
5 – 2
[2] Circuit description of control PWB
1. General description
Fig. 2 shows the functional blocks of the control PWB, which is com-
posed of 5 blocks.
2. Description of each block
2.1. Main control block
The main control block is composed of CONEXANT 1 chip fax engine
(CX93310), FLASH (16Mbit), SDRAM (64Mbit), LAN Controller
(LAN91C113).
Devices are connected to the bus to control the whole unit.
2.1.1 CX93310 (IC100): pin-216 LQFP (FAX CONTROLLER)
THis is a microcomputer with 32bit microprocessor core.
2.1.2 SST25VF016B (IC206): pin-8 SOIC (FLASH)
FLASH of 16Mbit equipped with software for the main CPU.
2.1.3 EDS6416AHTA-75-E (IC204): pin-54 TSOP (SDRAM)
On power on sequence, the firmware being compressed and stored in
SDRAM memory (IC204) is decompressed to this device. After
decompression, this device is used as a program execution memory. It
is also used as various work memories and communication buffer etc.
2.1.4 LAN91C113 (IC702): pin-128 TQFP (LAN CONTROL-
LER)
The interface to LAN. It is connected with an external bus interface
(8bit) of CX93310 (IC100).
2.1.5 SST25VF016B (IC201): pin-8 SOIC (FLASH)
For storage of data of various registration data and receiving image
such as TEL No.
2.2. IC100 (CX93310) Hardware description
2.2.1 Features
• 32-bit CPU provides convenient functional customization
• Embedded Image Processing DSP
- Scan noise removal
- Dark level and shading correction
- Linearization
- Resolution conversion
- Sharpening
- Error diffusion
- Background removal
- JPEG and JBIG compression/decompression
• FlexIO TM supports a variety of system configurations
- CIS and CCD control
- Scanner AFE control
- Direct thermal, thermal transfer, inkjet and laser print engine direct
control
- Motor control
• ITU-T V.17 facsimile modem function, with T.30, T.4, T.6, T.42 sup-
port
• Sleep mode to reduce power consumption
• Real Time Clock with Battery Backup
• Single voltage (3.3V) power with internal voltage regulator
• 5V-tolerant IO ports
• Compact lead-free (Pb-free) packages
- CX93310 Fax Engine Controller: 216-pin LQFP
2.2.2 System functions
1) Scan
Scanner control signals are provided by a FlexIO
TM
port to support
common CCD and CIS scanners. Digital scan data is also input over
this interface from the external video data ADC device.
2) Print
Printer control signals are provided by a FlexIO port to support com-
mon direct thermal, thermal transfer, and inkjet print mechanisms.
3) Copy
Simultaneous scan and print operations provide a copy function, which
includes support for image scaling (expansion to 200% and reduction
to 33%).
4) GPIOs
General purpose inputs/outputs (GPIOs) are provided that may be
used to support common interfaces such as an operator panel.
5) Modem
The embedded modem function provides synchronous 14400 bps
half-duplex modem with error detection and DTMF generation/recep-
tion. It provides data transmission/reception from regular PSTN lines,
PBX, or private lines, when interfaced to DAA (Data Access Arrange-
ment) circuitry via the CONEXANT CXxxxxx Integrated Analog device.
The modem can operate at any standard V.17 data speed up to 14400
bps as well as in V.21 and V.23 modes.
The modem is designed for use in Group 3 facsimile machines. It sat-
isfies the requirements specified in ITU-T recommendations V.17,
V.29, V.27ter, V.21 Channel 2, and T.4, and meets the signaling
requirements of T.30. It also performs HDLC framing according to T.30
at all speeds.
6) Concurrent operation
Several modes of concurrent operation are supported, such as scan-
ning to memory while receiving/printing a facsimile reception, without
operator intervention.
Fig. 2 Control PWB functional block diagram
(1) CX93310
FAX
CONTROLLER
(2) FLASH
16Mbit
(5) FLASH
16Mbit
(3) SDRAM
64Mbit
(4) LAN91C113
LAN
CONTROLLER